Assembly District 16 includes Lamorinda, Danville, San Ramon, Dublin, Pleasanton and southeastern Alameda County. Incumbent Joan Buchanan, D-Alamo, will term out this year.

Sponsored by four Contra Costa Democratic clubs and the Contra Costa Young Democrats, the free public event begins at 7 p.m. at the Lafayette Library and Community Learning Center, 3491 Mt. Diablo Blvd., in Lafayette.

The candidates will take written questions from the audience. KTVU journalist John Sasaki will moderate.